Compilare: user.cpp: In function ‘void ins(std::string, trie*, int, int)’: user.cpp:20:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s.size()==x){t->v.push_back(y);return;} ^ user.cpp: In function ‘int main()’: user.cpp:45:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<text.size();i++){ ^ user.cpp:53:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<p->v.size();i++)sum[p->v[i]]=p->nr; ^